WE HEAR . . .

THAT London tabloid reporters covering British Prime Minister Tony Blair and his family vacationing in Miami suspect that Blair might move there when he quits 10 Downing St. and launches a lucrative public speaking career . . . THAT CBS flacks are pouring cold water on a tip alleging Katie Couric made Secretary of State Condoleezza Rice cry during their last interview and that a tape exists of the never-aired sniffle.